Equalizing device for compression resistors



1,521,411 G. o. WILMS EQUALIZING DEVICE FOR COMPRESSION RESISTORS FiledJune 16, 1922' 2 Sheets-Sheet l Gustav U Wflm s Dec. 1924- 1,521,411

G. o. WILMS EQUALIZING DEVICE FOR COMPRESSION RESISTORS Filed June 16,1922 2 Sheets-Sheet 2 Gustav U-W11ms Patented 39, 19.2

umrsn STATES i,521,411 P TENT OFFICE.

GUSTAV O. WILMS, O3? MILWAUKEE,

EQUALIZING DEVICE Application filed June 3.6, 1922.

T 0 all whom it may concern:

Be it known that I, GUSTAV O. Winnie, a citizen of the United States andresident of Milwaukee, in the county of Milwaukee and State ofWisconsin, have invented new and useful Improvements in EqualizingDevices for Compression Resistors, of which the following is adescription, reference being had to the accompanying drawings, which area part of this specification.

This invention relates to certain new and useful improvements inelectric current controlling devices and refers more particu larly tomeans for applying equal. pressures to a multiplicity of currentcontrolling devices of the compression resistor type.

One object of this invention is to provide a pressure mechanism forapplying equal pressures to two or more resistors of the compressiontype in such a manner as to se cure the greatest mechanical advantage asthe operation of compressing the resistors is continued.

This invention has for another object to utilize the reacting force ofone of a group of compression resistors to produce pressure against oneor a group of other resistors.

It is a further object of this invention to provide means for producingpressure on a resistor of the compression type whereby the reactingforce of a member independent of the resistor is employed to producepressure thereon whereby maximum mechanical advantage is obtained as thecompression of the resistor is continued.

WVith the above and other objects in View which will appear as thedescription proceeds, my invention resides in the novel construction,combination and arrangement of parts substantially as hereinafterdescribed and more particularly defined by the appended claims, it beingunderstood that such changes in the precise embodiment of thehereindisclosed invention may be made as come within the scope of theclaims.

In the accompanying drawings, 1 have illustrated one complete example ofthe physical embodiment of my invention constructed according to thebest mode I have so far'devisedfor the practical application of theprinciples thereof, and in which:

Figure 1 is a side view of the upper end of several groups or series ofcompression type resistors equipped with my improved pressure producingmeans 5 TIISOO'IISIN, ASSIGEIQR T9 THE RELIANCE COM- PANY, 0F M1111AUKEE, "WISCGFSSZX JGRFURATION OF WISCONSIN.

CGMEYZESSIQJ EEFBISTORS.

Serial 1T0. 568,873.

Figure 2 is a top view of the means for equalizing the pressure appliedto the resistors of one group, said view being taken on the plane line22 of Figure 1, and

Figure 3 is transverse sectional view taken through Figure 2 on theplane of line Referring now more particularly to the accompanyingdrawings, the numerals 5 and 6 designate evener bars carried by one endof a rocker arm or saddle 7 pivotally mounted, as at 8, between a pairof spaced connected levers 9, the levers 9 having their inner endspivotally mounted between a bracket 10 and their outer ends connected bya block 11 having pintles 12 swivelled therein.

The evener bars are free to rock about pivot pins 13 and between thebars, adjacent one end, a U-shaped bracket 1a is secured. Pivotedbetween the evener bars, as at 15, adjacent the opposite end, a distancefrom the center of pivot 13 approximately one half of that from saidpivot to the center of bracket 5, is a channel bar 16 which extends toan equal distance from each side of .its pivot. Rock studs 17 extendfrom the channel bar at equal distance from pivot 13 and froa bracket 5and are engageable with resilient pressure plugs 18 which e):- tendthrough the bushin s of compression resistor units 19 and make contactwith the resistor disc therein (not shown).

As illustrated in Figures and 3, the other end of the saddle or rocker 7carries evener mechanism similar to that 1 reviously described andfurther description is therefore deemed unnecessary. It will also beapparent, by inspection of Figure 1, that evener mechanism of thecharacter described is provided for each group of resistor units 19.

An adjustable pull rod 20 extends through each swivel block 11 mountedbetween the free ends of each pair of levers 9 so that a downward pullof the rods will be equally transmitted to all the resilient pressureplugs 18. Each pull rod 20 is threaded in an adjustable yoke end 21which is bifurcated and pivoted to the outer end of the longer,substantially horizontal arm 22 of a bell crank 28, the same beingfulcrumed on a pin 24; carried by a stationary spider 25. The shorter,substantially vertical arm 26 of each bell crank has the outer end ofone member or link 27 of a toggle pivoted thereto, the other ends ofsaid links meeting at a common point and being connected by a pivot 28with an adjustable yoke 2,3) in which one end of a pull rod 30 isthreaded.

From the above it will be apparent l force applied to pull rod 30, tothe t' pivot or joint 28 and at right angles imaginary line drawnthrough the pins 2i will be transmitted equally to the bell cranks 23and thereby to levers It is also a, parent that as the angle between themenu bers 27 of the toggle becomes greater. i. e. as the togglestraightens out under downward pull. on rod 30, the mechanical.advantage increases.

lVhen the discs (not shown) within the resistance units have reached thelimit of compression, it is highly desirable to apply additionalpressure upon the rock studs 18 as it has been found that suchadditional static pressure reduces the ohmic resistance of the columnsof discs (not shown). To vary the resistance of these columns is theobject oi subjecting them to pressure. lVhen the resilient contacts havereached the limit of compression, which they will do before the togglelinks reach the angle of 180 degrees, the force applied through the pullrod 30 imparts a turning movement on the bell cranks equal to the lengthof members 27 multiplied by the horizontal COlllponent of the forceapplied through the toggle link. The horizontal components of w theforces producing the turning movements of the bell cranks are inopposite directions and, therefore, the reacting against one of thehorizontal components is the horizontal componentacting against theother bell crank.

hat I claim as my invention is:

1. In a device of the character described including two compressibleresistors, a pair of link members, means pivotally connecting the innerends of the link members to provide a toggle joint, means connecting theouter ends of the link members with the resistors whereby straighteningof the toggle joint compresses the resistors utilizing the reactingforce of one resistor to pix .uce pressure on the other, and means foractuating the toggle joint.

2. In a device of the character described including two compressibleresistor? and a compression. member for each resistor, a stress applyingmember for each resistor, means connecting one end of each stress applying member with the adjacent compression member, means connecting theother ends of the stress applying members, whereby the reacting force ofone resistor is utilzed to produce pressure against the other, 1nd anactuating member connected with :aid last mentioned means, wherebyactualon of the actuating member imparts an equal stress on the r sistol's through ll. iediuni oi. the compression memb: I A. applyingmembers and meansconnecting the stress applying men'ibcrs.

A device of the character described, comprising substantiallyindependent com pression memberv :tor actuating resistors, two rodsconnected one with ea n compression member, an actuating memb r. andmeans connecting the actuating men ber with tie rods and utilizing thereacting force of one resistor to produce prcsstn'c against the other.

4-. A device of the character described, comprising substantiallyindependent compression members for actuating compression resistors, tworods. one rod being adjustably connected with each compression member.an actuating member, and means connect ing the actuating member with therods and utilizing the reacting force of one re sister to producepressure against the other.

5. A device of the character described, comprising compression membersfor actuating compression resistors, bell cranks pivoted at their apesone adjacent each compression member, means connecting one arm of eachbell crank with the adjacent compression member, an actuating memberpositioned medially of the bell cranks, and a connection between theactuating member and the other arms of the bell cranks.

6. A device of the character described, comprising compression membersfor actuating compression resistors,bell cranks pivoted at their apexone adjacent each com pression member, means connecting one arm of eachbell crank with the adjacent compression member, an actuating memberpositioned medially of the hell cranks, and a toggle connection betweenthe actuating member and the other arms of the bell cranks whereby thereacting force of one resistor is utilized to produce pressure againstthe other.

7. A device of the character (lPSL'Ill'md. comprising a compressionmember for actuating a compression resistor, a bell crank pivotallymounted at its apex and having a substantially horizontal and asubstantially vertical arm, a connection between the horizontal arm ofthe bell crank and the compression member, an actuating member, a linkhaving one end pivotally connected with the actuating member and itsother end connected with the vertical arm of the bell crank, and asecond link having one end pivotally connected with the actuating memberand its other end connected with a support, said links being normallyout of longitudinal alinement whereby movement of the actuating memberto bring the link in longitudinal alinement will compress the resistor.

8. In a device of the character described,

the combination with groups of compression resistors and pressureevening means for imparting pressure to the units of each group of along and a short armed bell crank tor each group and pirotall secured atits apex, pull rods connecting th long arms of the bell cranks with theadjacent pressure evening means, a second pull rod mounted between thebell cranks, and a toggle connection between the short arms of the bellcranks and the second pull rod and including links pivoted to the bellcrank short arms and to the second pull rod.

9. A device of the character described,

GUSTAV O. WILMS.

